NOTE: ANY TIME I MENTION "RANGE", I SPECIFICALLY MEAN "HOW FAR THE CAR WENT" OR "HOW FAR IT WILL GO IN PRESCRIBED PARAMETERS", NOT THE "GUESS-O-METER" VALUE, UNLESS SPECIFICALLY STATED.
I'm getting ready to do a formal range test like the one that I just did for the Kia Soul EV.
http://insideevs.com/author/tony-williams/
Mercedes range so far:
91 miles traveled / 2.9 miles per kWh = 31.34kWh calculated burned
21% remaining on dash
100% - 21% = 79% consumed = 31.34kWh
But Mercedes says its a 36kWh battery, and 79% of that = 28.44kWh
If it's a 33kWh useable, that's 26kWh at 79% (we're getting farther from reality)
It was suggested that Mercedes has invented their own alternate universe of "economy" numbers, whereby the miles per kWh are based on some magic "from the wall" value and not the battery. So, let's say 85% charger efficiency will mean that 2.9 miles per kWh * (1 / 0.85) = 3.24 miles per kWh.
Then, 91 / 3.24 = 28kWh burned
(1 / 79) * 28 = 35.44kWh total available
(1/79) * 91 miles = 115 miles total range
Maybe.
So, there's a whole bunch of numbers that aren't even close.